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must people do maths by memorising formulas. this is ineffective in so many ways. instead you should learn to derive the formula by using an logical thinking and analysis. normally, you learn a topic which relates to the previous topic, the formulas which you've learn from them play a role in...

sorry, i took wrong angle (careless me) 10b) sin 18/x = sin 13/72 x=72sin18/sin13 x=98.907 10c)(c was wrong coz my x was wrong from previous answer) sin 31 = h/x sin 31 = h/98.907 98.907sin 31= h h = 50.9

i wasn't able to sleep last night! it's 7am now, i better pray! exam in 2.5 hours!

This is hsc, but i could never do these further questions in mechanics. A small ring C can move freely on a light inextensible string. The two ends of the string are attached to points A and B, where A is vertically above B and at a distance c from it. When the ring C is describing a...

what makes you so sure?

10b) let '<' be the angle sign <OTB= 90°-23° = 67° cos (<OTB) = OT/TB cos 67°= 85/x x=85/cos 67° x=217.5m 10c) <OTB=67° <TOB=90° <OBT=90-67=23° then <TBA=90-23=67° (or if you can just say <OTB=<TBA since alternate <, TO||AB) <BTA=23-20=3° therefore <BAT=180-(3+67)=110 (angle sum...

no one cares about justchillin?

what about question 8? and do you trust your teachers instincts?

well thats not too bad, if you rotate x by pi/4 you get +, which 4+6 happens to be 10. bah, too much rectangular hyperbolas for me

alright, i better not make the same mistake twice!

80/120 will secure a band 6

hey guys, just wondering, the question is find the volume of the solid formed, which i did but i wrote units square instead of units cube can i get penalised for this?

i don't even use scales, i just draw it and label the important points. as long as your graph doesn't look ridiculus it shouldn't matter. why waste time labelling the non important features? it's not like i'm going to get my exam back and be framing it on the wall or anything.

28ai) n=kd² sub in mini size 8=k20² 8=400k 8/400=k 0.02=k aii) n=kd² n=0.02x52² n=54.08 so you need 55 aiii) square area 25²=>625 circle area = pi x radius² 625=pi x radius² radius approx 14.10cm diameter=28.20 n=kd² n=0.02x28.20² n=15.90 so he needs 16

lol, you can draw it 10 by 9 and on the corner of page, write zoom ' x100'

Everyone Make Sure You Check Your Calculator Batteries!!

i highly doubt it happens now, my teacher reckons 70-75 should get you a E4

hmm, i find it weird, coz they don't give you a defined x, like if you square 5 or -5 both answers are 25 but if you square root 25, it's only 5. but i'll stick with what kfunk said and put it as zero. i guess you can assume that those points are at ±infinity and 1/infinity = zero?

ellipse b²=a²(1-e²) hyperbola b²=a²(e²-1) i'm sure you can make e the subject

i think it's undefined (open circle), since there is no x value on the asymptote, so how can you have 1/(nothing)??